On lower left corner there is a mark that may be a method of identification used by artist (see file, Registrar's office, for replication).
Inscribed, titled in pencil, on verso, left center: Beauvais- Cour | Place Hotel | de Ville [sic] On verso, upper right: [an inscription, relating to a numbering system, that is hard to decipher (see file, Registrar's office, for replication)]